Freeze Frame Data
- DESCRIPTION
- The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
HINT:
If it is impossible to duplicate the problem even though a DTC is detected, confirm the freeze frame data.
- The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the Techstream, five separate sets of freeze frame data, including the data values at the time when the DTC was set, can be checked.
- 3 data sets before the DTC was set
- 1 data set when the DTC was set
- 1 data set after the DTC was set
These data sets can be used to simulate the condition of the vehicle around the time of the occurrence of the malfunction. The data may assist in identifying of the cause of the malfunction, and in judging whether it was temporary or not.
- The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
- LIST OF FREEZE FRAME DATA
LABEL
(Techstream Display)Measurement Item Diagnostic Note Trouble Code Freeze DTC - Vehicle Speed Vehicle speed Speed indicated on speedometer Engine Speed Engine speed - Calculate Load Calculate load Calculated load by ECM Vehicle Load Vehicle load - MAF Mass air flow volume If value is approximately 0.0 g/s: - Mass air flow meter power source circuit open or shorted
- VG circuit open or shorted
If value is 160.0 g/s or more:- E2G circuit open
Atmosphere Pressure Atmospheric pressure - Coolant Temp Engine coolant temperature If value is -40 °C (-40 °F), sensor circuit open
If value is 140 °C (284 °F), sensor circuit shortedIntake Air Intake air temperature If value is -40 °C (-40 °F), sensor circuit open
If value is 140 °C (284 °F), sensor circuit shortedEngine Run Time Accumulated engine running time - Initial Engine Coolant Temp Initial engine coolant temperature - Initial Intake Air Temp Initial intake air temperature - Battery Voltage Battery voltage - Accel Sens. No. 1 Volt % Absolute Accelerator Pedal Position (APP) No. 1 - Accel Sens. No. 2 Volt % Absolute APP No. 2 - Throttle Sensor Volt % Throttle position Read value with ignition switch on (Do not start engine) Throttle Sensor #2 Volt % Throttle sensor positioning #2 Read value with ignition switch on (Do not start engine) Throttle Sensor Position Throttle sensor positioning Read value with ignition switch on (Do not start engine) Throttle Motor Duty Throttle motor - Injector (Port) Injector - Injector Volume (Cylinder 1) Injection volume - Fuel Pump Speed Control Fuel pump speed control status - Fuel Pump/Speed Status Fuel pump speed status VSV for EVAP controlled by ECM (ground side duty control) Vacuum Pump Key-off EVAP system leak detection pump status - EVAP (Purge) VSV EVAP purge VSV duty ratio - Evap Purge Flow Purge flow - Purge Density Learn Value Learning value of purge density - EVAP System Vent Valve Key-off EVAP system vent valve status - Tank Bypass VSV*1 Tank bypass VSV - Canister Control VSV*1 Canister control VSV - EVAP Purge VSV EVAP purge VSV - Target Air-Fuel Ratio Air-fuel ratio - AF Lambda B1 S1 Fuel trim at A/F sensor - AF Lambda B2 S1 Fuel trim at A/F sensor - AFS Voltage B1 S1 A/F sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor AFS Voltage B2 S1 A/F sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor AFS Current B1S1 Air fuel ratio sensor current - AFS Current B2S1 Air fuel ratio sensor current - O2S B1 S2 Heated oxygen sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor O2S B2 S2 Heated oxygen sensor output Performing Control the Injection Volume or Control the Injection Volume for A/F Sensor function of Active Test enables technician to check voltage output of sensor O2S Impedance B1 S2 Heated oxygen sensor impedance (Sensor 2) - O2S Impedance B2 S2 Heated oxygen sensor impedance (Sensor 2) - Short FT #1 Short-term fuel trim of bank 1 Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #1 Long-term fuel trim of bank 1 Overall fuel compensation carried out in long-term to compensate for a continual deviation of short-term fuel trim from central value Total FT #1 Total fuel trim of bank 1 - Short FT #2 Short-term fuel trim of bank 2 Short-term fuel compensation used to maintain air-fuel ratio at stoichiometric air-fuel ratio Long FT #2 Long-term fuel trim of bank 2 Overall fuel compensation carried out in long-term to compensate for a continual deviation of short-term fuel trim from central value Total FT #2 Total fuel trim of bank 2 - Fuel System Status #1 Fuel system status (bank 1) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using air fuel ratio sensor as feedback for fuel control
- OLDrive: Open loop due to driving conditions (fuel enrichment)
- OLFault: Open loop due to detected system fault
- CLFault: Closed loop but air fuel ratio sensor, which used for fuel control malfunctioning
Fuel System Status #2 Fuel system status (bank 2) - OL (Open Loop): Has not yet satisfied conditions to go closed loop
- CL (Closed Loop): Using air fuel ratio sensor as feedback for fuel control
- OLDrive: Open loop due to driving conditions (fuel enrichment)
- OLFault: Open loop due to detected system fault
- CLFault: Closed loop but air fuel ratio sensor, which used for fuel control malfunctioning
IGN Advance Ignition advance - Knock Feedback Value Feedback value of knocking - Knock Correct Learn Value Correction learning value of knocking - ACIS VSV VSV for Acoustic control induction system - AICV VSV VSV for Air Intake Control Induction System (AICS) - VVT Control Status #1 VVT control (bank 1) status ON or OFF Active test support data VVT Control Status #2 VVT control (bank 2 Intake side) status - VVT Aim Angle #1 VVT aim angle - VVT Change Angle #1 VVT change angle - VVT OCV Duty #1 VVT OCV operation duty - VVT Aim Angle #2 VVT aim angle (bank 2 Intake side) - VVT Change Angle #2 VVT change angle (bank 2 Intake side) - VVT OCV Duty #2 VVT OCV (bank 2 Intake side) operation duty - VVT Ex Hold Lrn Val #1 VVT exhaust hold duty ratio learning value (bank 1 Exhaust side) - VVT Ex Chg Angle #1 VVT change angle (bank 1 Exhaust side) - VVT Ex OCV Duty #1 VVT OCV (bank 1 Exhaust side) operation duty - VVT Ex Hold Lrn Val #2 VVT exhaust hold duty ratio learning value (bank 2 Exhaust side) - VVT Ex Chg Angle #2 VVT change angle (bank 2 Exhaust side) - VVT Ex OCV Duty #2 VVT OCV (bank 2 Exhaust side) operation duty - Catalyst Temp B1 S1 Catalyst temperature - Catalyst Temp B2 S1 Catalyst temperature - Catalyst Temp B1 S2 Catalyst temperature - Catalyst Temp B2 S2 Catalyst temperature - Starter Signal Starter signal - Starter Control Starter switch status - Power Steering Signal Record Power steering signal (history) - Starter Relay Starter relay status - Power Steer. Sig. Record Power steering signal (history) This signal status usually ON until ignition switch turned off ACC Relay ACC relay status - Neutral Position SW Signal Park/neutral position switch status ON or OFF - Stop Light Switch Stop light switch - A/C Signal A/C signal - Close Throttle Position SW Closed throttle position switch - Electrical Load Signal Electrical load signal - Time after DTC Cleared Cumulative time after DTC cleared - Distance from DTC Cleared Accumulated distance after DTC cleared - Warmup Cycle Cleared DTC Warm-up cycle after DTC cleared - TC and TE1 TC and TE1 terminals of DLC3 - Ignition Trig. Count Ignition - Cylinder #1 Misfire Count Cylinder #1 misfire count - Cylinder #2 Misfire Count Cylinder #2 misfire count - Cylinder #3 Misfire Count Cylinder #3 misfire count - Cylinder #4 Misfire Count Cylinder #4 misfire count - Cylinder #5 Misfire Count Cylinder #5 misfire count - Cylinder #6 Misfire Count Cylinder #6 misfire count - All Cylinders Misfire Count All cylinder misfire count - Misfire RPM Misfire RPM - Misfire Load Misfire load - Misfire Margin Misfire monitoring - Catalyst OT MF F/C Catalyst over temperature misfire prevention F/C not available - Cat OT MF F/C History Catalyst over temperature misfire prevention fuel cut history OFF - Cat OT MF F/C Cylinder#1 Display of fuel cut operation in No. 1 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#2 Display of fuel cut operation in No. 2 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#3 Display of fuel cut operation in No. 3 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#4 Display of fuel cut operation in No. 4 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#5 Display of fuel cut operation in No. 5 cylinder (if certain level of misfire malfunction is detected) - Cat OT MF F/C Cylinder#6 Display of fuel cut operation in No. 6 cylinder (if certain level of misfire malfunction is detected) - ACM ACM control status - Electric Fan Motor Electric fan motor - Idle Fuel Cut Idle fuel cut ON: when throttle valve fully closed and engine speed over 1500 RPM FC TAU FC TAU Fuel cut initiated under light load to prevent incomplete combustion *1: Only for Mexico models